A Concrete Office Built for the Silk Trade
The Toyota City Youth Guidance Center (豊田市青少年相談所), formerly the Aichi Prefectural Sericulture Supervision Office No. 9 Branch (旧愛知県蚕業取締所第九支所, also written Kyū Aichi-ken Sangyō Torishimarisho Dai-kyū Shisho), is a single-storey reinforced concrete government building of 1922 at Kita-cho 4-45 in Toyota City, Aichi Prefecture, entered in the national register of Tangible Cultural Properties on October 18, 2000.
Reinforced concrete was still a novelty in provincial Japan when this building went up. The first reinforced concrete structures in the country date to around 1911, so a prefectural branch office in a market town of the Nishi-Mikawa region was working with a material barely a decade into its Japanese career. Local accounts describe it as the oldest surviving reinforced concrete building within the present boundaries of Toyota City, though that claim rests on secondary sources rather than the national register itself.
The office it housed existed because of silk. Japan's Silkworm Egg Inspection Act of 1897 obliged prefectures to police the quality of silkworm eggs, and Aichi, then among the country's leading sericulture prefectures, built out a network of inspection stations: a head office inside the prefectural government and thirteen branches across the region. The Koromo sub-office opened in 1913 under the No. 4 Branch and was promoted to full branch status in 1921. The new premises followed the year after. Staff here checked eggs for disease and carried out breeding research while the surrounding town of Koromo, the settlement that would later be renamed Toyota, handled cocoon trading for the whole of western Mikawa.
The Agency for Cultural Affairs record adds a small puzzle. Its descriptive note refers to the building as a former prefectural sericulture experiment station rather than a supervision office branch. The registered name and the local historical record both point to the latter, and the discrepancy appears to be an inconsistency in the database entry.
Registered as a Model of Design
Japan's registration system for Tangible Cultural Properties, introduced in 1996, admits buildings under one of three criteria. This one was registered under the first of them, the criterion covering buildings that set a standard in design. The registration number is 23-0048, and the public notice followed on November 6, 2000.
What the assessors were looking at is a building that argues with itself. The plan is a shallow U, opening toward the rear, with a total floor area of 556 square metres under a tiled roof. The window openings run wide and horizontal in a way that reads as thoroughly Western, the sort of banding that concrete construction made cheap and that timber framing had never permitted at that scale.
Then the Japanese details arrive. A chidori-hafu, the triangular dormer gable of temple and castle carpentry, sits above the main entrance and again on the gable ends. Each column head carries a daito, the squared bearing block that in a wooden building would transfer roof load, along with hijiki bracket arms. None of these elements is doing structural work here. Concrete columns do not need bracket blocks. They are quotations, cast in the new material, from the vocabulary of the old one.
This kind of grafting became a recognised national style in the 1930s, when public buildings across Japan were given tiled roofs and Japanese detailing over modern frames. A 1922 branch office in Aichi sits well before that fashion consolidated, which is part of why the design registers as instructive rather than merely decorative.
What to Look For, and How to Get There
Start at the column heads. The daito and hijiki are small, high up, and easy to walk past, but they are the clearest evidence of what the architect was attempting. Compare the crispness of their cast edges against the softer profiles a chisel leaves in wood, and the substitution announces itself.
Then step back to take in the entrance elevation as a whole. The dormer gable above the door tries to give a symmetrical, horizontally banded facade a vertical accent and a roofline of the sort a Japanese visitor of 1922 would have read as official and dignified. Whether the two halves of the argument reconcile is a matter of taste. Watching them fail to quite agree is the more interesting exercise.
The building is a five-minute walk east of Toyota-shi Station on the Meitetsu Mikawa and Toyota lines, on the road that runs toward Toyota Stadium. It stands directly on the street, so the front elevation and the registered gate in front of it can be seen and photographed from the public road at any hour without charge.
Interior access is another matter. From November 2005 the building housed the Toyota City Museum of Modern Industry and Daily Life, a free municipal museum of local industrial history, and it was open to the public throughout those years. That museum closed on March 31, 2023, and its collections and functions passed to the new Toyota City Museum, which opened at Kozaka-honmachi 5-80 on April 26, 2024. No regular public opening of the interior has been announced since. Anyone hoping to see inside should contact the Toyota City Cultural Properties Division on 0565-32-6561 before travelling.
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Q&A
- Can visitors go inside the Toyota City Youth Guidance Center (former Aichi Prefectural Sericulture Supervision Office No. 9 Branch)?
- Not on a regular basis at present. The museum that occupied the building was open free of charge until March 31, 2023, but closed when its functions moved to the new Toyota City Museum. The exterior and the gate remain visible from the street. Check with the Toyota City Cultural Properties Division (0565-32-6561) for any current arrangements.
- How do I reach the former Aichi Prefectural Sericulture Supervision Office No. 9 Branch from the nearest station?
- Leave Toyota-shi Station on the Meitetsu Mikawa Line or Toyota Line by the east side and walk about five minutes along the road heading toward Toyota Stadium. The address is Kita-cho 4-45. The building sits on the street frontage with its stone gate facing the road.
- Is photography of the Toyota City Youth Guidance Center permitted?
- The exterior faces a public road, so photographing it from the street presents no difficulty. The gate, registered separately, makes a natural frame for the entrance elevation. Since the site is city property and no longer operates as a visitor facility, avoid entering the grounds without permission.
- Why is the Toyota City Youth Guidance Center considered significant?
- It is an early provincial example of reinforced concrete construction, dating to 1922 when the material had been used in Japan for barely a decade, and it applies Japanese architectural motifs such as the chidori-hafu gable and daito bearing blocks to a Western-derived concrete form. It was registered in 2000 under the criterion of serving as a model of design.
- What was the building used for after the sericulture office closed?
- The Aichi sericulture supervision system was abolished in 1955. The building served as the Koromo municipal library from 1953, then as a practical nursing school run by the Toyota-Kamo Medical Association from 1970, and as the Toyota City Youth Guidance Center from April 1975 to March 2004. The last of these gave the property its registered name.
Basic Information
| Name | Toyota City Youth Guidance Center (former Aichi Prefectural Sericulture Supervision Office No. 9 Branch) / 豊田市青少年相談所（旧愛知県蚕業取締所第九支所） |
|---|---|
| Location | Kita-cho 4-45, Toyota City, Aichi Prefecture |
| Designation | Registered Tangible Cultural Property (Structures); registration number 23-0048; criterion: model of design |
| Year Designated | Registered October 18, 2000; public notice November 6, 2000 |
| Quantity | 1 building |
| Dimensions | Reinforced concrete, single storey, tiled roof; building area 556 square metres |
| Owner | Toyota City |
| Public Access | Exterior visible from the public road at any time, free of charge. No regular interior opening since the resident museum closed on March 31, 2023. Enquiries: Toyota City Cultural Properties Division, 0565-32-6561 |
References
- National Cultural Properties Database, Agency for Cultural Affairs: Toyota City Youth Guidance Center (former Aichi Prefectural Sericulture Supervision Office No. 9 Branch)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00001913
- Cultural Heritage Online: Toyota City Youth Guidance Center (former Aichi Prefectural Sericulture Supervision Office No. 9 Branch)
- https://online.bunka.go.jp/heritages/detail/181823
- Toyota City: Designated, Registered and Selected Cultural Properties
- https://www.city.toyota.aichi.jp/sportsbunka/bunka/1009223/1005361.html
- National Cultural Properties Database, Agency for Cultural Affairs: Gate of the Toyota City Youth Guidance Center
- https://kunishitei.bunka.go.jp/heritage/detail/101/00001914
Last verified: 2026.08.04